CN217112682U - Clamp function failure monitoring device for detecting laboratory electrical measuring equipment - Google Patents

Abstract

A clamp function failure monitoring device for detecting laboratory electrical measuring equipment belongs to the field of monitoring devices, is provided for the problems of out-of-control temperature and abnormal pressure of a terminal part of a clamp, and comprises a pressure monitoring unitThe pressure monitoring unit comprises a pressure sensor unit and a pressure sensor signal acquisition special chip unit, and the central control unit comprises a serial data interface, an I ² C digital interface and UART interface, the temperature monitoring unit includes infrared temperature sensor unit. The real-time fault monitoring and fault positioning design can timely find possible problems of the detection equipment, improve the detection precision, improve the detection accuracy of the detection laboratory of the electrical detection equipment and reduce the re-detection workload.

Description

Fixture function failure monitoring device for testing laboratory electrical measuring equipment

technical field

The utility model relates to the field of monitoring devices, in particular to a device for monitoring the function failure of a jig used for the detection of electrical measuring equipment in a laboratory.

Background technique

With the development of my country's smart grid development strategy, the popularization and application of smart electric metering equipment has grown explosively, and the detection of metering equipment has gradually shifted from traditional manual operations to automation and flexibility with faster verification speed, higher verification quality and more complete functions. Make full use of automation technology to carry out assembly line verification of smart energy meters, so that they can complete various verification tasks independently without human intervention.

The electric energy meter verification device is mainly used to verify the electric energy meter. Its main function is under the control of the computer or the keyboard. The pulse is sent to the error calculation unit, and the error calculation unit calculates the error. The calculated error is displayed locally and sent to the computer through the control center for display and data processing, so as to achieve the purpose of verifying the electric energy meter.

Flexible detection technology is an automatic detection technology that can be intelligently regulated. According to the characteristics of the detection object and the difference of the detection task, the detection method is judged and adjusted to achieve the effect of detecting more products within a fixed period and shortening the product detection cycle. Its characteristics in the automatic verification system of smart energy meters are as follows: (1) It can meet the terminal wiring methods of single-phase meters, energy controllers, fusion terminals and three-phase smart energy meters of different specifications and types, that is, a detection device can Adapt to different specifications of the test table; (2) Carry out the verification test according to the corresponding verification procedures and specifications, and improve the success rate of wiring, thereby increasing the production capacity.

The automatic wiring device is a key part of automatic verification. In projects such as withstand voltage testing and multi-function testing, it is necessary to connect a testing device to the terminals of the electric energy meter, and input the specified voltage, current or communication signal to detect its parameters or functions. meet the corresponding specifications. There are a large number of terminals in the smart energy meter, and each different detection object has a unique wiring method. The original manual wiring and disconnection is time-consuming and laborious, and there are problems such as low reliability. The automatic wiring used in the flexible automated testing laboratory Through the cooperation of transmission line, jacking platform, stop mechanism, pneumatic crimping mechanism and other devices, the accurate positioning of the electric energy meter at the corresponding detection device and the successful connection with the detection device are realized. Electric energy meter, testing equipment interface adopts unified fixture design, fixture connection testing equipment end adopts unified design, detection object connection fixture interface adopts customized design, signal transmission terminal directly connected to electric energy meter terminal during detection is fixed inside the fixture, signal transmission terminal Includes sliding rod and sleeve, with spring inside and retractable length. The design of automatic wiring device and integrated fixture greatly improves wiring efficiency and enhances the flexibility of verification.

Disadvantages of the existing technology:

In the actual operation process, the connection and signal transmission between the terminal of the fixture and the terminal of the electric meter are realized by the top pressure contact at the end, and the end of the terminal will have poor contact. High temperatures can damage energy meters, fixtures, and even cause fires. In addition, the long-term live operation of the terminal of the detection device will accelerate the oxidation speed of the metal terminal, causing the terminal to corrode, further increasing the contact resistance, and causing a higher current temperature rise. On the other hand, during long-term operation, the smart electric energy meter is frequently connected to the terminal of the fixture, which will cause the deformation of the mechanical crimping terminal of the fixture or the relaxation of the elastic force of the spring, resulting in unstable connection and other problems. The damage and functional degradation of these key components will directly affect the reliability of the error test results, thereby affecting the verification quality of the smart energy meter. At present, the provincial metrology centers under the State Grid Corporation generally use the method of regular inspection to overhaul the meter positions of the verification line. This method cannot detect the fault of the meter position in time, and relies on manual troubleshooting, which has insufficient reliability and high labor costs.

Utility model content

In order to overcome the above-mentioned defects of the prior art, the utility model provides a device for monitoring the function failure of a fixture for the detection of laboratory electrical measuring equipment, which can solve the problems of temperature out-of-control and abnormal pressure at the terminal of the fixture.

The technical scheme adopted by the utility model is:

A fixture function failure monitoring device for laboratory electrical measuring equipment detection includes a pressure monitoring unit, a central control unit, a temperature monitoring unit and a 4G module unit. The pressure monitoring unit includes a pressure sensor unit and a special chip unit for pressure sensor signal acquisition. The central control unit includes a serial data interface, an I ² C digital interface and a UART interface, and the temperature monitoring unit includes an infrared temperature sensor unit;

The pressure sensor unit is connected to the input end of the pressure sensor signal acquisition special chip unit, the output end of the pressure sensor signal acquisition special chip unit is connected to the serial data interface of the central control unit, the infrared temperature sensor The unit is connected with the I ² C digital interface of the central control unit, and the 4G module unit is connected with the UART interface of the central control unit.

Further, the number of the pressure sensor units is several.

Further, the number of the pressure sensor units is 4.

Further, the number of the infrared temperature sensor units is several.

Further, the number of the infrared temperature sensor units is four.

Further, the model of the central control unit is: STM32F417VGT6 or STM32F417ZGT6.

Further, the pressure sensor model is: ARIZON-2179.

Further, the infrared temperature sensor model: MLX90614.

The beneficial effects of the present utility model are:

1. In view of the possible failure causes of the clamp terminals, a monitoring scheme corresponding to the failure of the function has been added, which improves the functional reliability level of the clamp detection device.

2. The real-time fault monitoring and fault location design can find out the possible problems of the detection equipment in time, and to a certain extent, avoid the situation that the detection accuracy is reduced due to the failure of the fixture function, so as to ensure the detection accuracy of the detection table body of the electric measurement equipment. , which improves the testing accuracy of the electrical measuring equipment testing laboratory, reduces the workload of re-inspection, and further improves the automation level of the electrical measuring equipment testing laboratory, reducing the burden of manual troubleshooting.

Description of drawings

Fig. 1 is the principle block diagram of the fixture function failure monitoring device for the detection of laboratory electrical measuring equipment;

2 is a schematic block diagram of an embodiment of a fixture function failure monitoring device for the detection of laboratory electrical measuring equipment;

3 is a schematic diagram of the use position of the infrared temperature sensor of the fixture function failure monitoring device for the detection of laboratory electrical measuring equipment;

4 is a schematic diagram of the use position of the pressure sensor of the fixture function failure monitoring device for the detection of laboratory electrical measuring equipment;

FIG. 5 is a circuit diagram of a special chip for signal processing of a pressure sensor of a fixture function failure monitoring device for the detection of laboratory electrical measuring equipment;

Fig. 6 is the controller circuit diagram of the pressure sensor of the fixture function failure monitoring device for the detection of laboratory electrical measuring equipment;

Detailed ways

As shown in Figure 1 and Figure 2, the device for monitoring the function failure of the fixture for the detection of laboratory electrical measuring equipment includes a pressure monitoring unit, a central control unit, a temperature monitoring unit and a 4G module unit, and the pressure monitoring unit includes a pressure sensor ARIZON-2179 Unit and pressure sensor signal acquisition special chip unit, the central control unit includes serial data interface, I ² C digital interface and UART interface, and the temperature monitoring unit includes infrared temperature sensor MLX90614 unit.

The pressure sensor ARIZON-2179 unit is connected to the input end of the pressure sensor signal acquisition special chip unit, the output end of the pressure sensor signal acquisition special chip unit is connected to the serial data interface of the central control unit, and the The infrared temperature sensor MLX90614 unit is connected with the I ² C digital interface of the central control unit, and the 4G module unit is connected with the UART interface of the central control unit.

The pressure sensor ARIZON-2179 unit is used to monitor the terminal spring pressure and output the signal to the pressure sensor signal acquisition dedicated chip unit;

The pressure sensor signal acquisition special chip unit is used to transmit the result of measuring pressure to the central control unit in digital form through the serial data interface of the central control unit;

The central control unit is used to count, analyze and process the monitored temperature and pressure information, compare it with the preset standard value, and send a control signal to cut off the working power of the corresponding table position in time when an abnormal situation occurs and send the fault information. .

The infrared temperature sensor MLX90614 unit is used to monitor the terminal temperature through the infrared temperature sensor, and transmit the temperature information processing to the central control unit through the I ² C digital interface;

The 4G module unit sends fault information to the staff's mobile phone according to the instructions of the central control unit.

The implementation process of this embodiment is as follows:

In this embodiment, real-time monitoring is mainly carried out from the main two aspects of the failure of the clamp signal terminal, which is divided into a temperature monitoring unit and a pressure monitoring unit, which respectively detect the temperature and pressure on the terminal. When the wiring is prepared before the electric energy meter test project, the power is turned on to start monitoring.

As shown in Fig. 1, Fig. 2, Fig. 3, the temperature monitoring unit senses the temperature of the wiring signal terminal through the temperature sensor unit. In the embodiment of the temperature monitoring unit, it can be described as sensing the temperature of the wiring signal terminal through an infrared temperature sensor. Since the infrared temperature sensor It detects the temperature within its field of view, so it can convert the temperature information within the detection range into digital signal information and transmit it to the central control unit through the I ² C digital interface. The central control unit will analyze and process the obtained temperature data. If the temperature of the terminal in a certain temperature monitoring area is higher than the preset temperature value, the central control unit sends a signal to cut off the power supply corresponding to the table position of the detection device. The central control unit calculates the current value in the line according to the load, so as to calculate the probe The normal temperature value, if it exceeds the preset temperature value, it is determined that the contact resistance of the probe in the temperature monitoring area becomes larger, and the phenomenon is determined to be a fault phenomenon. The method of automatically cutting off the power supply adopts the traditional relay + contactor method. At the same time, the location of the faulty station is sent to the staff's mobile phone through the 4G module unit for notification.

Among them, the temperature sensor is installed in different positions according to different models and usage methods, and it is necessary to ensure that each terminal can be monitored. Taking the infrared temperature sensor as an example, the infrared temperature sensor is installed directly above the wiring signal terminal through the necessary support structure. According to the distance from the sensor probe to the terminal and the diameter range of the measured terminal, select the appropriate number of sensors and specifications to ensure that the measurement range is covered. all terminals.

Considering that in this design, the temperature of the signal terminal of the fixture is measured, and the actual wiring signal terminal of the fixture is more and the space near it is limited, if a contact temperature sensor is used, it is necessary to connect a sensor at each terminal, which may cause problems. There are the problems of difficulty in connecting the sensor and insufficient space for the connection.

If you choose PT100 platinum resistance, you can consider adding a temperature sensor to each probe. The advantage is that the positioning is accurate after a problem occurs. The disadvantage is that the contact temperature measurement needs to do many other aspects to ensure the safety of the system operation.

The temperature sensor should be all temperature sensors that can complete the target monitoring task, including the infrared temperature sensor. The infrared temperature sensor is non-contact in temperature measurement. One sensor can cover multiple terminals, and the non-contact feature makes the installation position more flexible, and there is no problem of insufficient space. It is the best choice. Therefore, the infrared sensor was used as an example before.

As shown in Figure 1, Figure 2, Figure 4, the pressure monitoring unit performs real-time monitoring through the pressure sensing device fixed at the bottom of the inner spring of the wiring signal pin, and transmits the pressure value information to the center through the serial data interface of the central control unit The control unit, if the pressure value of a terminal is significantly different from the pressure of other terminals working at the same time or the pressure information cannot be detected for a long time, the central control unit sends a control signal to immediately stop the detection experiment of the station. Among them, the central control unit The implementation of the method is as follows: through continuous data statistics of the pressure signal value, a preset value is set for the program in the central control unit, and when the preset value is not reached, it is determined that it is faulty. Then the fault information is sent to the staff mobile phone through the 4G module unit.

At the same time, it is possible to periodically compare the difference between the pressure value of the terminal during the detection of the fault-free standard fixture and the detection pressure value after a certain period of time. If it exceeds a certain error range, the 4G module unit will send the aging parts to be replaced. The fault signal is sent to the mobile phone of the staff to avoid affecting the accuracy of the verification.

In this example, the pressure sensor model: ARIZON-2179, the infrared temperature sensor model: MLX90614, the central control unit model: STM32F417VGT6 or STM32F417ZGT6 can be used.

It should be noted that in the above embodiments, as long as the technical solutions that are not contradictory can be arranged and combined, those skilled in the art can exhaust all possibilities according to the mathematical knowledge of the arrangement and combination. The solutions are described one by one, but it should be understood that the technical solutions after the arrangement and combination have been disclosed by the present invention.

This embodiment is only an exemplary description of this patent, and does not limit its protection scope. Those skilled in the art can also make partial changes to it, as long as it does not exceed the spirit of this patent, it is within the protection scope of this patent.

Claims (8)

1. a fixture function failure monitoring device for laboratory electrical measurement equipment detection, is characterized in that, comprises pressure monitoring unit, central control unit, temperature monitoring unit and 4G module unit, and described pressure monitoring unit comprises pressure sensor unit and pressure sensor signal acquisition a dedicated chip unit, the central control unit includes a serial data interface, an I ² C digital interface and a UART interface, and the temperature monitoring unit includes an infrared temperature sensor unit; The pressure sensor unit is connected to the input end of the pressure sensor signal acquisition special chip unit, the output end of the pressure sensor signal acquisition special chip unit is connected to the serial data interface of the central control unit, the infrared temperature sensor The unit is connected with the I ² C digital interface of the central control unit, and the 4G module unit is connected with the UART interface of the central control unit. 2 . The device for monitoring the function failure of a fixture for detecting electrical measuring equipment in a laboratory according to claim 1 , wherein the number of the pressure sensor units is several. 3 . 3 . The device for monitoring the function failure of a fixture for the detection of laboratory electrical measuring equipment according to claim 2 , wherein the number of the pressure sensor units is 4. 4 . 4 . The device for monitoring the function failure of a fixture for detecting electrical measuring equipment in a laboratory according to claim 3 , wherein the number of the infrared temperature sensor units is several. 5 . 5 . The device for monitoring the function failure of a fixture for the detection of laboratory electrical measuring equipment according to claim 4 , wherein the number of the infrared temperature sensor units is 4. 6 . 6 . The device for monitoring the function failure of a fixture for the detection of laboratory electrical measuring equipment according to claim 5 , wherein the model of the central control unit is: STM32F417VGT6 or STM32F417ZGT6. 7 . 7 . The device for monitoring the function failure of a fixture for the detection of laboratory electrical measuring equipment according to claim 6 , wherein the pressure sensor model is: ARIZON-2179. 8 . 8 . The device for monitoring the function failure of a fixture for the detection of laboratory electrical measuring equipment according to claim 7 , wherein the infrared temperature sensor model is MLX90614. 9 .

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